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arXiv 1411.1978math.AP
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Neumann-to-Dirichlet映射关于系数矩阵$H$ -收敛的连续性

Continuity properties of Neumann-to-Dirichlet maps with respect to the $H$-convergence of the coefficient matrices

Luca Rondi

摘要:

我们研究边界算子,如Neumann-to-Dirichlet映射,关于基本椭圆型方程的系数矩阵的连续性。我们表明,对于非光滑系数的正确的概念的收敛是一个由$H$ -收敛(或$G$ -收敛对称矩阵)。我们证明了与用于解决所谓的逆电导率问题的变分方法相关的最小问题的存在性结果,至少如果我们允许电导率是各向异性的。在各向同性电导率的情况下,我们表明,在某些情况下存在的极小可能会失败。

英文摘要:

We investigate the continuity of boundary operators, such as the Neumann-to-Dirichlet map, with respect to the coefficient matrices of the underlying elliptic equations. We show that for nonsmooth coefficients the correct notion of convergence is the one provided by $H$-convergence (or $G$-convergence for symmetric matrices). We prove existence results for minimum problems associated to variational methods used to solve the so-called inverse conductivity problem, at least if we allow the conductivities to be anisotropic. In the case of isotropic conductivities we show that on certain occasions existence of a minimizer may fail.

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